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| Mirrors > Home > ILE Home > Th. List > pnfnre | Unicode version | ||
| Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.) |
| Ref | Expression |
|---|---|
| pnfnre |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnex 8253 |
. . . . . 6
| |
| 2 | 1 | uniex 4560 |
. . . . 5
|
| 3 | pwuninel2 6515 |
. . . . 5
| |
| 4 | 2, 3 | ax-mp 5 |
. . . 4
|
| 5 | df-pnf 8312 |
. . . . 5
| |
| 6 | 5 | eleq1i 2300 |
. . . 4
|
| 7 | 4, 6 | mtbir 678 |
. . 3
|
| 8 | recn 8262 |
. . 3
| |
| 9 | 7, 8 | mto 668 |
. 2
|
| 10 | 9 | nelir 2512 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4230 ax-un 4556 ax-cnex 8220 ax-resscn 8221 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-nel 2510 df-rex 2528 df-rab 2531 df-v 2817 df-in 3219 df-ss 3226 df-pw 3673 df-uni 3917 df-pnf 8312 |
| This theorem is referenced by: renepnf 8323 nn0nepnf 9573 xrltnr 10115 pnfnlt 10123 xnn0lenn0nn0 10201 inftonninf 10808 pcgcd1 13030 pc2dvds 13032 |
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